Measurements of Atmospheric Boundary Layer O3,NOx and CO in Summer with Beijing 325m Meteorological Tower
北京气象塔夏季大气O3,NOx和CO浓度变化的观测实验

Based on the Beijing 325m meteorological tower,O3,NOx and CO concentrations and meteorological parameters in urban atmospheric boundary layer were measured in July 2002.The variations of O3 concentration were remarkably different among the five levels.Contrasted with the higher levels,the daily variations were clear and the difference values between day and night were large in the lower levels.It was also found that the photochemistry reaction was an important source in boundary layer in daytime and precipitation process could arouse marked change of O3 concentration.